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High-severity SharePoint RCE bug patched by Microsoft (CVE-2026-45659)

Help Net Security
CVEMicrosoftVulnerabilityRCE

Overview

Microsoft has patched a serious remote code execution vulnerability in SharePoint, identified as CVE-2026-45659. This flaw impacts SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016. The vulnerability arises from the way SharePoint handles untrusted data, allowing an authenticated attacker to execute code on a vulnerable server without requiring any user interaction. The simplicity of the attack makes it particularly concerning, as it poses a risk to organizations using these versions of SharePoint. Companies should prioritize applying the patches to safeguard their systems from potential exploitation.

Key Takeaways

  • Affected Systems: SharePoint Server Subscription Edition, SharePoint Server 2019, SharePoint Enterprise Server 2016
  • Action Required: Microsoft has released patches for the affected SharePoint versions.
  • Timeline: Newly disclosed

Original Article Summary

Microsoft has released patches for a high-severity remote code execution vulnerability (CVE-2026-45659) in SharePoint that may be exploited in low-complexity attacks. It affects the SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016. About CVE-2026-45659 CVE-2026-45659 stems from Shareoint deserializing untrusted data, and may be exploited by an authenticated attacker to execute code remotely on a vulnerable SharePoint Server instance – no user interaction required. “The attack complexity is Low (AC:L) because … More → The post High-severity SharePoint RCE bug patched by Microsoft (CVE-2026-45659) appeared first on Help Net Security.

Impact

SharePoint Server Subscription Edition, SharePoint Server 2019, SharePoint Enterprise Server 2016

Exploitation Status

The exploitation status is currently unknown. Monitor vendor advisories and security bulletins for updates.

Timeline

Newly disclosed

Remediation

Microsoft has released patches for the affected SharePoint versions. Users should ensure they update to the latest versions to mitigate this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Microsoft, Vulnerability, and 1 more.

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